Grain orientation dependence of extended planar dislocation boundaries in rolled aluminium

The dislocation boundary alignment in 124 grains in cold-rolled aluminium has been investigated by a combination of backscattered electron channelling contrast and electron backscatter diffraction. The asymmetric slip geometry of the Copper and S orientations together with the existence of different symmetry variants of these orientations is exploited to analyse whether the grain orientation (and consequently the slip systems) or the symmetric rolling geometry determines the boundary alignment. The results unambiguously point at the grain orientation as the controlling factor.